1. What is a System Boiler Sizing Calculator?

Definition: This calculator estimates the required boiler power in kilowatts based on the heat output in BTU/h.

Purpose: It helps HVAC professionals and engineers properly size boiler systems for heating applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Boiler power (kilowatts)
• \( Q_{btu} \) — Heat output (BTU per hour)

Explanation: The formula converts British Thermal Units per hour to kilowatts using the conversion factor 3412 BTU/h = 1 kW.

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing ensures efficient operation, prevents energy waste, and maintains system reliability.

4. Using the Calculator

Tips: Enter the required heat output in BTU/h. The value must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: Why 3412 as the conversion factor?
A: 3412 BTU/h equals 1 kW, which is the standard conversion between these units of power.

Q2: How do I determine the required heat output?
A: Calculate building heat loss or sum the heat requirements of all connected equipment.

Q3: Should I add a safety factor?
A: Yes, typical practice is to add 10-20% to the calculated boiler size for safety margin.

Q4: What about boiler efficiency?
A: This calculation gives theoretical power. Divide by boiler efficiency (typically 0.8-0.95) for actual size.

Q5: Can I use this for steam boilers?
A: This calculates power requirements. Steam boilers require additional considerations like pressure and steam quality.